package com.company.JUC;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.locks.Condition;

public class ListTest {
    public static void main(String[] args) {
        List<String> list = new CopyOnWriteArrayList<>();
        Map<String,String> map = new ConcurrentHashMap<>();
        for(int i =0;i<10;i++){
            new Thread(()->{
              list.add(UUID.randomUUID().toString().substring(0,5));
                System.out.println(list);
            }).start();
        }

    }
}
